Intermetallic Charge Transfer in A-Site-Ordered Double Perovskite BiCu3Fe4O12
Intermetallic Charge Transfer in A-Site-Ordered Double Perovskite BiCu3Fe4O12
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DOI：
10.1021/ic901128k
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发表时间：
2009-09-07
影响因子：
4.6
通讯作者：
Shimakawa, Yuichi
中科院分区：
文献类型：
--
作者：
Long, Youwen;Saito, Takashi;Shimakawa, Yuichi
在高温高压条件下合成了A位有序的双钙钛矿结构BiCu3Fe4O12。与LaCu_3Fe_4O_（12）的结构相似，温度诱导的A ′位Cu和B位Fe离子间的电荷转移发生在比LaCu_3Fe_4O_（12）（393 K）更高的温度（428 K）。这种电荷转移导致体积收缩0.6%的同构相变以及超导体到金属和反铁磁性到顺磁性的转变。虽然在A位的Bi阳离子不参加电荷转移，它似乎通过稳定的正方形平面配位的Cu 3+提高电荷转移温度。
An A-site-ordered double perovskite BiCu3Fe4O12 was synthesized at high-pressure and high-temperature conditions. Similar to the isostructural LaCu3Fe4O12, the temperaure-induced intermetallic charge transfer between the A'-site Cu and the B-site Fe ions occurs but at higher temperature (428 K) than LaCu3Fe4O12 (393 K) does. This charge transfer causes an isostructural phase transition with volume contraction by 0.6% as well as semiconductor-to-metal and antiferromagnetism-to-paramagnetism transitions. Although the Bi cation at the A site does not take part in the charge transfer, it appears to enhance the charge-transfer temperature by stabilizing the square-planar coordinated Cu3+.